feat: VivesPOS landing on Winter CMS 1.2 — theme + plugin + Dockerfile

- Base: wintercms/winter branch 1.2 (full framework)
- Theme vivespos: Canvas 7 + Bootstrap 5 CDN, custom CSS
- Layout: deferred GTM/GA4 tracking, JSON-LD SoftwareApplication
- Partials: hero (offline-first), features, modes (offline/nube toggle),
  screenshots, pricing (3 planes), comparison, FAQ, CTA
- Plugin VivesPOS.Site with ContactForm
- Dockerfile: PHP 8.2 Apache, port 80, healthcheck
- Added winter/wn-pages, blog, sitemap, seo plugins
- Active theme set to vivespos

modules/backend/models/user/columns.yaml

@@ -0,0 +1,76 @@
+# ===================================
+#  Column Definitions
+# ===================================
+
+columns:
+
+    first_name:
+        label: backend::lang.user.first_name
+        searchable: true
+        invisible: true
+
+    last_name:
+        label: backend::lang.user.last_name
+        searchable: true
+        invisible: true
+
+    full_name:
+        label: backend::lang.user.full_name
+        select: concat(first_name, ' ', last_name)
+        searchable: true
+        invisible: true
+
+    login:
+        label: backend::lang.user.login
+        searchable: true
+        width: 15%
+
+    email:
+        label: backend::lang.user.email
+        searchable: true
+
+    groups:
+        label: backend::lang.user.groups
+        relation: groups
+        select: name
+        sortable: false
+
+    role:
+        label: backend::lang.user.role.name
+        relation: role
+        select: name
+        sortable: true
+        searchable: true
+
+    last_login:
+        label: backend::lang.user.last_login
+        searchable: true
+        type: datetime
+
+    created_at:
+        label: backend::lang.user.created_at
+        searchable: true
+        invisible: true
+        type: datetime
+
+    updated_at:
+        label: backend::lang.user.updated_at
+        searchable: true
+        invisible: true
+        type: datetime
+
+    deleted_at:
+        label: backend::lang.user.deleted_at
+        searchable: true
+        invisible: true
+        type: datetime
+
+    is_activated:
+        label: backend::lang.user.activated
+        invisible: true
+        type: switch
+
+    is_superuser:
+        label: backend::lang.user.superuser
+        invisible: true
+        type: switch